{"id":"UBUNTU-CVE-2026-115386","details":"Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fd_readdir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of leftover host stack or heap memory per directory entry.","modified":"2026-10-27T04:17:47.639374047Z","published":"2026-10-26T00:00:00Z","upstream":["CVE-2026-115386"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-115386"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-115386"},{"type":"REPORT","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-96f6-r43r-8c24"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/wasmtime-before-36.0.17-37.0.0-before-48.0.4-and-49.0.0-before-49.0.2-memory-disclosure-via-fd-readdir"}],"affected":[{"package":{"name":"rust-wasmtime","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/rust-wasmtime?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["10.0.1+dfsg-7","15.0.1+dfsg-4","16.0.0+dfsg-2","16.0.0+dfsg-3"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-cranelift-dev","binary_version":"0.103.0+16.0.0+dfsg-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115386.json"}},{"package":{"name":"rust-wasmtime","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/rust-wasmtime?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["36.0.5+dfsg-1","36.0.13+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-cranelift-dev","binary_version":"0.123.13+36.0.13+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115386.json"}},{"package":{"name":"rust-wasmtime","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rust-wasmtime?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["26.0.1+dfsg-3","26.0.1+dfsg-4","28.0.1+dfsg-3","29.0.1+dfsg-5","36.0.5+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-cranelift-dev","binary_version":"0.123.5+36.0.5+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115386.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}